Burns Cleaner than WoodDuraflame fire logs light faster and burn more completely than firewood, and because far less material is consumed when burning a fire log, significantly fewer pollutants are emitted than a comparable wood fire.80% less fine particles**.75% less carbon monoxide**.90% less hazardous air pollutants**.Saves TreesA duraflame fire log consumes 80% less material than a comparable 1-2 hour wood fire, and burning fire logs instead of wood results in significantly fewer trees cut down for use as firewood.Recycled & RenewableDuraflame fire logs use recycled and renewable wood sawdust and agricultural fibers, saving valuable natural resources. The renewable fibers are mixed with blend of wax and other combustible, renewable materials. CSIA Chimney Safety Institute of America Accepted Product™ When used according to the manufacturer's instructions, this product is accepted by the Chimney Safety Institute of America.For improved safety and home heating efficiency, CSIA recommends that all chimneys and vented appliances be inspected every year by a CSIA Certified Chimney Sweep®. Fast Lighting—Lights Fully in Less than 5 Min. Burns Cleaner than Wood Burns over 1.5 Hours * UL Classification Mark America's #1 Fire Log Brand Tonight's the Night